Optical Network Unit Power Saving via Traffic-Aware Sleep Modes
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Solution Overview
Problem
Optical network units (ONUs) in optical access networks consume significant power due to continuous operation, even when actual user usage is low, leading to inefficient power usage and increased energy dissipation.
Innovation Solution
The ONU is equipped with a power saving function that includes a processor to detect data traffic through multiple communication ports, allowing it to operate in full or partial sleep modes, thereby interrupting power to unnecessary components when no traffic is detected, and switching back to active mode upon traffic resumption, along with a cyclic sleep and wake-up mechanism for connectivity checks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the ONU operates continuously to maintain connectivity and respond to data traffic, then service reliability is improved, but power consumption increases significantly
Solution Approach 1:
The patent implements dynamic power management by transitioning the ONU between active and sleep modes based on real-time traffic detection. The system dynamically adjusts its operational state from continuous operation to intermittent operation, reducing power consumption while maintaining connectivity reliability through periodic wake-up cycles and traffic-aware state changes.
Solution Approach 2:
The patent employs periodic wake-up cycles where the ONU transitions from sleep mode to active mode at predetermined intervals to check for data traffic. This periodic action allows the system to maintain connectivity reliability through regular connectivity checks while significantly reducing power consumption compared to continuous operation.
2Use of energy by moving object
If the ONU enters sleep mode to reduce power consumption, then power consumption is reduced, but response time to data traffic increases
Solution Approach 1:
The patent uses periodic wake-up cycles at predetermined intervals to check for data traffic while in sleep mode. This periodic checking mechanism balances power consumption reduction with acceptable response time by ensuring the ONU wakes up regularly to assess traffic conditions without remaining in continuous active state.
Solution Approach 2:
The patent implements a feedback mechanism where traffic detection results determine the ONU's operational state. When traffic is detected during wake-up cycles, the system transitions to active mode and processes data. This feedback loop ensures timely response to actual data traffic while maintaining power-saving sleep mode during periods without traffic.
3Measurement precision
If the ONU monitors all communication ports continuously to detect traffic accurately, then traffic detection accuracy is improved, but processing complexity increases
Solution Approach 1:
The patent applies periodic monitoring of communication ports rather than continuous monitoring. The system checks traffic status at predetermined intervals during wake-up cycles, achieving sufficient traffic detection accuracy while reducing processing complexity and power consumption associated with continuous monitoring of all ports.
Data Source
AI summary
An optical network unit (ONU) having a power saving function for reducing power consumption in an optical network and a power saving method thereof are provided. The ONU includes a first signal transmitter-receiver unit configured to transmit and receive a signal to and from an optical line terminal, a second signal transmitter-receiver unit configured to transmit and receive a signal to and from customer premises equipment through multiple communication ports, a signal processing unit configured to control a signal to be transmitted and received through the first signal transmitter-receiver unit and the second signal transmitter-receiver unit, and a processor configured to control powers of the first signal transmitter-receiver unit and the signal processing unit according to whether data traffic is received through the plurality of communication ports.